1. Department of Large Animal Clinical Sciences, University of Florida College of Veterinary Medicine, Gainesville, FL, USA
2. Department of Animal Sciences, University of Florida College of Agriculture and Life Sciences, Gainesville, FL, USA
3. D. H. Barron Reproductive and PerinatalBiology Research Program, University of Florida, Gainesville, FL, USA
4. Department of Infectious Diseases and Immunology, University of Florida College of Veterinary Medicine, Gainesville, FL, USA